.page-faq {
  --faq-gap: clamp(24px, 4vw, 56px);
  --faq-sticky-top: 128px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 7vw, 88px) clamp(56px, 9vw, 112px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(118deg, rgba(18, 59, 46, 0.92) 0%, rgba(18, 59, 46, 0.35) 42%, rgba(11, 18, 32, 0) 68%),
    repeating-linear-gradient(118deg, rgba(56, 225, 198, 0.07) 0 2px, transparent 2px 16px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -12%;
  width: 52%;
  aspect-ratio: 1 / 1;
  pointer-events: none;
  background: linear-gradient(205deg, rgba(56, 225, 198, 0.16), rgba(255, 122, 47, 0.09));
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 76%);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__note {
  position: absolute;
  top: clamp(120px, 16vw, 190px);
  right: 18px;
  z-index: 1;
  color: var(--dim);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
  margin-top: clamp(26px, 4vw, 52px);
}

.page-faq .faq-hero__lead h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
  margin: 0 0 20px;
  margin-left: -0.04em;
  max-width: 16ch;
}

.page-faq .faq-hero__intro {
  font-size: 17px;
  line-height: 1.85;
  color: var(--dim);
  max-width: 60ch;
  margin: 0 0 14px;
}

.page-faq .faq-hero__intro--sub {
  color: var(--mist);
  font-weight: 600;
  margin-bottom: 0;
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 0 0 26px;
  padding: 0 0 0 18px;
  border-left: 3px solid var(--cyan);
  display: grid;
  gap: 10px;
}

.page-faq .faq-hero__facts li {
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-hero__facts .num {
  color: var(--cyan);
  font-size: 22px;
  font-weight: 700;
  margin-right: 6px;
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 章节带在浅底上的处理 ---------- */

.page-faq .section--mist .chapter-band {
  background: var(--night);
  color: var(--mist);
}

/* ---------- 左右分栏 ---------- */

.page-faq .faq-split {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-faq .faq-split__rail h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--mist);
  margin: 8px 0 16px;
  max-width: 18ch;
}

.page-faq .faq-split__text {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 22px;
  max-width: 46ch;
}

.page-faq .section--mist .faq-split__rail h2 {
  color: var(--night);
}

.page-faq .section--mist .faq-split__text {
  color: #3A4459;
}

.page-faq .faq-rail__figure {
  margin: 0;
}

.page-faq .media-frame img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 步骤卡 ---------- */

.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-faq .faq-step {
  position: relative;
  background: var(--panel);
  border: 3px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  padding: 24px 22px 22px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-step:hover {
  transform: translate(-2px, -2px);
  border-color: var(--cyan);
}

.page-faq .faq-steps--linked > .faq-step + .faq-step::before {
  content: "";
  position: absolute;
  left: 36px;
  top: -20px;
  width: 2px;
  height: 20px;
  background: repeating-linear-gradient(to bottom, var(--cyan) 0 4px, transparent 4px 9px);
}

.page-faq .faq-step__num {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  border: 1px solid var(--orange);
  border-radius: 999px;
  padding: 3px 11px;
  margin-bottom: 14px;
}

.page-faq .faq-step__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--mist);
  margin: 0 0 10px;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--dim);
}

.page-faq .faq-step__tips {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 9px;
}

.page-faq .faq-step__tips li {
  position: relative;
  padding-left: 17px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--dim);
}

.page-faq .faq-step__tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 2px;
}

/* ---------- 分段控件区 ---------- */

.page-faq .faq-topics__head {
  margin-top: clamp(20px, 3vw, 36px);
  margin-bottom: clamp(22px, 3vw, 34px);
  max-width: 62ch;
}

.page-faq .faq-topics__head h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--night);
  margin: 0 0 12px;
}

.page-faq .faq-topics__head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: #3A4459;
}

.page-faq .faq-segmented {
  margin-bottom: clamp(24px, 3.5vw, 38px);
}

.page-faq .faq-panel[hidden] {
  display: none;
}

.page-faq .faq-panel:not([hidden]) {
  animation: faq-slide-in 0.24s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

@keyframes faq-slide-in {
  from {
    transform: translateX(18px);
  }
  to {
    transform: translateX(0);
  }
}

.page-faq .faq-panel__grid {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-panel__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--night);
  margin: 0 0 22px;
}

.page-faq .faq-panel .faq-step {
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-note {
  background: var(--panel);
  border: 3px solid var(--teal);
  border-radius: var(--radius);
  padding: 22px 20px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .faq-note__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--mist);
  margin: 0;
}

.page-faq .faq-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
}

.page-faq .faq-note__figure {
  margin: 0 0 4px;
}

.page-faq .faq-note__link {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 3px;
  justify-self: start;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-note__link:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.page-faq .faq-note__link:focus-visible,
.page-faq .faq-chips a:focus-visible,
.page-faq .faq-channel__value:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 手风琴 ---------- */

.page-faq .faq-acc {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  background: var(--night);
  border: 3px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-item:hover {
  transform: translate(-2px, -2px);
}

.page-faq .faq-item[open] {
  border-color: var(--cyan);
}

.page-faq .faq-item__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

.page-faq .faq-item__head::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__head:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-faq .faq-item__q {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 2px solid var(--cyan);
  border-radius: 2px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-faq .faq-item__mark::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .faq-item__mark::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  transition: transform 0.2s ease;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .faq-item__body {
  padding: 18px 20px 22px;
  border-top: 1px dashed var(--line);
  animation: faq-acc-in 0.24s ease both;
}

@keyframes faq-acc-in {
  from {
    transform: translateY(-6px);
  }
  to {
    transform: translateY(0);
  }
}

.page-faq .faq-item__steps {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--dim);
}

.page-faq .faq-item__steps li::marker {
  color: var(--orange);
  font-family: var(--font-data);
}

/* ---------- 联系支持 ---------- */

.page-faq .faq-help__grid {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-faq .faq-help__lead h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--mist);
  margin: 0 0 16px;
  max-width: 18ch;
}

.page-faq .faq-help__lead p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--dim);
  margin: 0 0 26px;
  max-width: 48ch;
}

.page-faq .faq-help__cards {
  display: grid;
  gap: 16px;
}

.page-faq .faq-channel {
  background: var(--panel);
  border: 3px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  padding: 20px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-faq .faq-channel--plain {
  border-left-color: var(--cyan);
}

.page-faq .faq-channel__label {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--dim);
  margin: 0;
}

.page-faq .faq-channel__value {
  font-family: var(--font-data);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
  text-decoration: none;
  word-break: break-word;
}

.page-faq .faq-channel a.faq-channel__value {
  border-bottom: 2px solid var(--cyan);
  justify-self: start;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-channel a.faq-channel__value:hover {
  color: var(--cyan);
  border-color: var(--orange);
}

.page-faq .faq-channel__foot {
  font-size: 14px;
  line-height: 1.7;
  color: var(--dim);
  margin: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-segmented .segmented__item {
    flex: 1 1 0;
  }

  .page-faq .faq-help__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-channel--plain {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-faq .faq-split__rail {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-panel__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-help__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-faq .faq-help__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-steps {
    gap: 24px;
  }

  .page-faq .faq-step {
    padding: 28px 26px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-item,
  .page-faq .faq-note__link,
  .page-faq .faq-channel a.faq-channel__value {
    transition: none;
  }

  .page-faq .faq-panel:not([hidden]),
  .page-faq .faq-item__body {
    animation: none;
  }

  .page-faq .faq-step:hover,
  .page-faq .faq-item:hover {
    transform: none;
  }
}